Revenue Recognition (Additional Information) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total rental property revenues		$ 657,515	$ 475,212	$ 466,185
Rental property revenues
Disaggregation of Revenue [Line Items]
Total rental property revenues	$ 628,800	628,751	463,401	455,305
Variable rental revenue	$ 176,600
Variable rental revenue
Disaggregation of Revenue [Line Items]
Total rental property revenues			119,300	115,900
Fees and other
Disaggregation of Revenue [Line Items]
Total rental property revenues		$ 28,800	$ 11,800	$ 10,900